Date and Time Settings

I am looking for a way to change my date and time settings that does not just impact my profile. I want for everyone else who uses my dashboard to be under the same date and time period that I am using. For instance, it is 9am in my date and time settings, but my colleague is in a different time zone and it is 8am where they are located. How do I make sure that when they look at my sheet or dashboard that they see the same date and time? Thank you in advance for your assistance.